Questions tagged [high-current]
Say how much current is required, high-current means different things to different people.
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THT power transistor clamp mounting
I have a question regarding mounting THT power transistors (TO220, TO247...). I am building a output full bridge for a welder and I thought about not using PCB at all for the power terminals (D,S). It'...
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X-ray power input and power output Confusion
I was looking at the power calculations of the X-ray machines and found something a bit unusual. As we know the input power must be equal to the output power. Considering an x-ray machine giving an ...
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High current, low voltage pulsed DC transformer
I'm trying to understand the feasibility of a DC transformer that takes a low voltage, high current pulse and converts it to a lower voltage, higher current pulse (with a resistive load on the output)....
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STM32F407 Heating up, the decoupling capacitors showing short to ground with multimeter but microcontroller seems working fine
I have an stm32f407 which was running okay for like a month. but now i am seeing that whenever I connect power supply the current consumption is very high and the MCU is heating up a lot. The ...
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Is this circuit suitable for switching 3 kA? [closed]
So I wish to switch a current of roughly 3 kA on for short periods of time roughly every second. I have created a circuit shown below which I believe will be sufficient but after past failures I would ...
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Coordination Protection (Selective and Sensitive) [closed]
How to determine the sensitivity and selectivity of OCR relay? What parameters need to be considered? Are there any limits or standards of these? Or these are any formula for these parameter?
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Over-current/short-circuit protection for the battery bank
I am using a 24 V 100 A additional vehicle alternator for charging my additional battery bank of 24 V. I need an over-current/short-circuit protection for my battery bank. I am considering using a DC ...
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Transient output voltage on high-side MOSFET switch upon start up
For my application, I am using 4S10P Li-ion battery (with NXP's RDDRONE-BMS772) to power the following load:
8 ESCs to control thrusters
1 Raspberry Pi with hat to control ROV (powered from 5V buck ...
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HV and LV transformer coupling not working, no current from LV transformer?
I am trying to couple a high voltage transformer (automobile coil) 220 V to 10 kV, with a low voltage home made transformer 220 V to 6, 12 V (think MOT but bigger).
I have tested/used the LV ...
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High Current Step-Down Conversion 12V-5V/100A
I inherited two 12 V, 1200 W server power supplies a while back and I'd like to press them into service as electrolysis cell power supplies for making (per)chlorates. I need to drop the output to ~5 ...
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How to calculate the size of copper strip with high current and high frequency?
We can easily find the recommended cross-sectional area of copper wire when the current is DC.
But when the frequency is high, e.g., 13.56MHz, how could we calculate a suitable size of copper strip to ...
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How to convert low voltage digital signal (0-3.3V) to high power current signal 15-40W ranging from 1kHz to 1MHz?
I need to convert a digital signal generated from a microcontroller GPIO (0-3.3V) to a high-power (15-40W) current signal to drive an LED chip for illuminance, where the signal frequency can range ...
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How much resistance do I need to discharge my capacitor without hurting it [closed]
I’m building a coil-gun and I just got a 400 V 1.3 mF electrolytic capacitor which will discharge a large current. However, my coil is made of 1 mm^2 copper enamel wire which has an resistance of only ...
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Why don't we use the third harmonic in power transmission?
For some high power high voltage lines DC is used with the advantage that sinus wave AC obviously doesn't use the line to it's maximum capacity at all times. To correct this, we could use square wave ...
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Reducing current for 5x5 IR transmitter matrix
I'm currently working on a project that involves a 25 IR transmitter matrix, with each individual IR transmitter requiring around 50mA of current. This results in a total current requirement of ...
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What characteristics should I be looking in to choose a MOSFET?
I have an application which I need to switch a 1000 W 24 V 40 A inverter on, and I do need a way to switch it on with a MOSFET (I don't understand the way how to choose it properly) although in the ...
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Current limiting in a ESC
How is current limited in high-power circuits such as ESCs, considering that they might provide tens of Amperes of current?
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How do I power an inverter using a combination of a car and an external battery but limit the current taken from the car to only 100A?
The car in question is a Nissan Leaf, whose 12V "starter" battery is replenished by an onboard DC-DC converter with a maximum safe output of about 100A (this is used as a handy way to tap ...
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Protection of the power supply input from high voltage pulses
I am assembling a power supply for xenon arc lamps. I use a simple welding inverter as a stable current source. I use the presented scheme.
The ignition circuit generates pulses up to 25-30 kV for a ...
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Why are pads not connected all way around in copper filled areas? [duplicate]
I'm designing a circuit that will supposedly pass 30A continuous, I assumed the best I can do to prevent tracks from burning is just use copper fill so that essentially the whole area is my high ...
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Is it ok to connect a 10000 μF Capacitor to a lithium-ion battery directly?
I have a 24 V lithium-ion battery which will pump as Iᵐᵃˣ 40 A and I need to connect a capacitor directly to the 24 V battery which will be 10000 μF(10 mF).
The usage of it is to keep the system ...
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DC-DC Powering Sensitive IO ICs
I have a high-powered buck DC-DC board with low RDSON FET's (10-20 A) that powers IC's that are sensitive to noise on the IO circuitry. I've done the usual of input/output bypass caps, RC snubbers, ...
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Can I connect an off-the-shelf boost converter and a buck converter end to end?
I have a 9~15 volt source (a battery) that I need to turn into stable 12 volts efficiently. The load (a graphics card) will draw up to 200 watts. Can I just get a boost converter and a buck converter ...
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Need help with high current step up DC
I need to design external battery for my flash.
I have checked it works with 4-6v DC with ~6a current to charge the capacitor in 2-3 second.
I have 18650 battery planning to use in 1S configuration. ...
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How to drive high and low side FET with 3.3V microcontroller?
This picture describes the current state of my project that I am working on. I am making a half-bridge high-current motor driver (that will eventually evolve into a full-bridge). The motor is ...
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LTspice 1000A simulation
I want to simulate a 1000A current flowing through a circuit in LTspice. The supply voltage is 230V AC @ 50Hz. This circuit will also have 0.05 milliohm in series with the load (this resistor acts as ...
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Looking for alternative analog/digital circuits to drive low impedance with high current
I am looking to drive a load with the specifications as follows:
Load Resistance = 2.2 ±0.3 Ω
Load Current = 1.5-4.5 A
Nominal Load Current = 2 A
The load current should never go below 1.25 A at any ...
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high current PCB traces: do we need many?
According to some calculations on this site (using standardized IPC-2221) it seems that a set of parallel traces handles more current than if they are joined in a single trace. Why?
https://www.4pcb....
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Maximum current drawn from transformer
I'm using the following transformer with the output in a parallel configuration such that the input is 230V and the output is 12V. considering the tranformer is rated for 100VA this means the maximum ...
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Is it possible to damage your respiratory system from high current circuits by breathing in air pollutants from hot components? [closed]
I was working on a BLDC motor circuit in my apartment which has 1 small room and not much airflow. I am using up to 30V and 10A to drive the motor. Because I am still testing on a breadboard, a lot of ...
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Driving high power direction indicator LED
I am using a direction indicator LED "2BA 013 398-03" from Hella for our robot. The system power is 24 V. The main microcontroller that also controls the LED on/off, can not provide the ...
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How do you safely measure large AC currents using a multimeter without a current clamp?
I would like to measure the RMS current draw of several house appliances, in addition to the primary and secondary side current of a step-down transformer.
Simply placing my multimeter in series with ...
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I need to build a high current, low voltage buck converter
I am trying to power a 14 mΩ resistive load at 0.3 V 21.5 A to add some buffer to the design I'm trying to design for 30 A, since the load can change.
Without going too in depth the load is a new ...
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BQ2054: Studying the impact of high-current charging EV Li-po batteries at high C-rates and most common charging methods used
I am trying to replicate the charging method of fast-charging stations for electric vehicles using one or two Li-po cells. The purpose of the experiment is to measure the impact of high C-rates on Li-...
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BMS design for 150 A continuous current
I have to design a BMS for a 12s, 1p battery configuration. I am using a BQ76952 IC to do voltage measurement and passive balancing. The continuous discharge current is 150 A and peak current is 300 A....
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How to sense if a heater is plugged and on
I want to remotely check if one of my home sockets (which happens to power a heater) is transmitting current or not. I do this as a hobby project, so my main priority is to learn through the process ...
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Connecting a shunt capacitor with a small resistance in series
Will this circuit draw too much current from my power supply? I have this schematic that I found from similar work to mine. However, they seem to have used a very small resistance before the large ...
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High current traces (up to 60 A) routing problem
I need to design a power inverter that might have up to 60 A of current flowing through the leg IGBTs and still could not figure out the best way out for that amount of current. The DC bus voltage may ...
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How to measure and control AC current in BLDC motor
I tried to measure the AC current for the BLDC motor in a single phase (Phase B). I use Timer 1 to generate PWM and Timer 4 for changes that occur in the commutation state (ie step change occurs ...
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Can I connect aluminium conductor to copper bus bar?
This is a follow-up for the aluminum bar question here: Aluminum bus bars connection to PCB
My design now is based on copper - low resistance, assembly by soldering. For now, this is probably the best....
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In practice, is the ganging of a large number of SCRs in parallel often more expensive than an equivalent hockey puck?
In a separate but related question, I asked how EEs normally wire a large number of SCRs in parallel for high current applications. For this 1 example (sample size = 1), I found a single hockey puck ...
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How does an IGBT 120A, 450 watt welding machine inverter mechanism work?
How can "RYU Weld Machine Inverter 120A IGBT 450 watt" be advertised so? Does it really output less than 4V?
How is such a rating determined?
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How can I switch polarity for high power device?
I have a power supply that can deliver from 0 to 1400W (100V - 14A) to an electromagnet. I want to be able to switch the polarity with an electrical signal. I cannot use mechanical relays because it ...
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How to dynamically simulate an EV plug disconnection in order to automate charging power setup
I bought a well-made Chinese charger for our Zoe ZE50 R110 electric vehicle.
It can be set to various charging levels (8,10,12,16A at 220V), but as a safety (I guess), the procedure requires me to ...
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Power transformer with four similar secondary windings connected in parallel
I need help with the math that is glossed over in nearly every explanation I can find on the web.
I have a transformer with a toroid core and primary that were professionally assembled and rated at ...
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PCBs for ultra-high current
How are PCBs that handle ultra-high current designed?
For example, there are IGBTs on Digi-Key that are rated at > 200 A and can be soldered onto a PCB.
How do those parts get utilized? Wouldn't ...
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Making a MOSFET-based constant 14 VDC input to constant 11 VDC (8-20 A) output voltage regulator circuit
I have a constant 14 VDC source and I want to get a constant regulated output of 11 VDC regardless of the load current, knowing that the load is varing from 8 to 20 A with low frequency. What is the ...
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How to measure current up to 1000A and not go bankrupt
I need to measure current going through my PCB, which can be anything between -1200A to +1200A. Accuracy within 1-2% with bandwidth of anything higher than 50kHz.
The conductor is decided by now - I ...
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Battery fuses breaking capacity: main and accessories
I am looking to size several fuses' breaking capacities on a battery circuit.
Let's consider F1 = 300 A; F2 = 20 A; F3 = 40 A.
Given the battery is high-power and can output several kAs, the main fuse ...
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How do high current paths work in PCB design?
Using a calculator like this one I see that the trace width required for 10 A is 9.36 mm at 2 oz (highest JLCPCB offers).
My IRLZ44N transistor has 2.54 mm spaced legs, so how does putting two 10 mm ...
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